关键词: 玉米, 内生细菌, 种群, 动态分析, 遗传背景

Abstract: Based on the observation on the flowering phenology in the whole growth season of 2008, the dynamics, patterns, and elationships among various parameters of flowering phenology of alpine meadow plant community in eastern Qinghai Tibetan Plateau were studied, and the  potential effects of above mentioned factors on the species coexistence of the plant community were approached. The flowering period of the plant community started from early May, came into peak period in the first ten days of August, and ended in early October, extending all over whole growth period. Different species had their different first flowering date, peak flowering period, and flowering duration, and their flowering phenological niches differentiated obviously. Most species had their peak flowering period centralized in July-August. There was a negative relationship between peak flowering period and flowering duration: the earlier the flowering, the longer the flowering duration. The differences in flowering phonology among the species were mainly determined by species per se characteristics and environmental conditions, but the flowering phenological pattern on community level was primarily controlled by abiotic factors.

Key words: Maize, Entophytic bacteria, Population, Dynamic analysis, Genetic background